I am new to java/android. I am trying to create an AlertDialog inside
my SmartApp class when an event is fired in my DataRobot class. I am
getting an error when doing this. The event is firing and calling the
function successfully in SmartApp, but when it gets to alert.show()
the following error is printed to logcat. Does anyone know what i am
doing wrong or a better way to implement what i am wanting? The
AlertDialog does not pop up on screen, logcat just complains about
something. Code and logcat output below:
02-06 10:27:30.673: VERBOSE/SmartApp(276): data alert event caught
02-06 10:27:31.013: WARN/System.err(276):
java.lang.RuntimeException: Can't create handler inside thread that
has not called Looper.prepare()
02-06 10:27:31.042: WARN/System.err(276): at
android.os.Handler.<init>(Handler.java:121)
02-06 10:27:31.052: WARN/System.err(276): at
android.view.ViewRoot.<init>(ViewRoot.java:231)
02-06 10:27:31.052: WARN/System.err(276): at
android.view.WindowManagerImpl.addView(WindowManagerImpl.java:148)
02-06 10:27:31.062: WARN/System.err(276): at
android.view.WindowManagerImpl.addView(WindowManagerImpl.java:91)
02-06 10:27:31.082: WARN/System.err(276): at
android.view.Window$LocalWindowManager.addView(Window.java:424)
02-06 10:27:31.082: WARN/System.err(276): at
android.app.Dialog.show(Dialog.java:241)
02-06 10:27:31.102: WARN/System.err(276): at
cpe495.smartapp.SmartApp$4.dataAlertReceived(SmartApp.java:80)
02-06 10:27:31.102: WARN/System.err(276): at
cpe495.smartapp.DataRobot.fireDataAlertEvent(DataRobot.java:96)
02-06 10:27:31.122: WARN/System.err(276): at
cpe495.smartapp.DataRobot.analyzeData(DataRobot.java:32)
02-06 10:27:31.122: WARN/System.err(276): at
cpe495.smartapp.SmartApp$2.dataReceivedReceived(SmartApp.java:66)
02-06 10:27:31.133: WARN/System.err(276): at
cpe495.smartapp.ConnectDevice.fireDataReceivedEvent(ConnectDevice.java:
71)
02-06 10:27:31.133: WARN/System.err(276): at
cpe495.smartapp.ConnectDevice.run(ConnectDevice.java:42)
02-06 10:27:31.153: WARN/System.err(276): at
java.lang.Thread.run(Thread.java:1096)
---
// datarobot class
public class DataRobot extends Activity {
/* This class is for analyzing the data */
private List _listeners = new ArrayList();
private List<DataAlertListener> _listeners2 = new
ArrayList<DataAlertListener>();
private SmartDataObject data;
private int sI1;
private int sI2;
private float w1;
private float w2;
private float w3;
private int hRB;
private int hRVMin;
private int hRVMax;
public boolean analyzeData(SmartDataObject temp) {
/* Analyze the data
* Returns true if data was successfully analyzed
* Returns false if an error occurred
*/
data = temp;
if(data.getHeartRate()>290) {
fireDataAlertEvent();
}
fireDataAnalyzedEvent(data);
return true; //for now this will always return true
}
public synchronized void addDataAnalyzedListener(DataAnalyzedListener
listener) {
_listeners.add(listener);
}
public synchronized void
removeDataAnalyzedListener(DataAnalyzedListener listener) {
_listeners.remove(listener);
}
private synchronized void fireDataAnalyzedEvent(SmartDataObject temp)
{
DataAnalyzedEvent dRE = new DataAnalyzedEvent(this, temp);
Iterator listeners = _listeners.iterator();
while(listeners.hasNext()) {
((DataAnalyzedListener)listeners.next()).dataAnalyzedReceived(dRE);
}
}
public interface DataAnalyzedListener {
public void dataAnalyzedReceived(DataAnalyzedEvent event);
}
public synchronized void addDataAlertListener(DataAlertListener
listener) {
_listeners2.add(listener);
}
public synchronized void removeDataAlertListener(DataAlertListener
listener) {
_listeners2.remove(listener);
}
private synchronized void fireDataAlertEvent() {
DataAlertEvent dAE = new DataAlertEvent(this);
Iterator listeners = _listeners2.iterator();
while(listeners.hasNext()) {
((DataAlertListener)listeners.next()).dataAlertReceived(dAE);
}
}
public interface DataAlertListener {
public void dataAlertReceived(DataAlertEvent event);
}
}
---
public class DataAlertEvent extends EventObject {
public DataAlertEvent(Object source) {
super(source);
// TODO Auto-generated constructor stub
}
}
---
public class SmartApp extends Activity implements
OnSharedPreferenceChangeListener {
TextView smartConnectionStatus;
TextView testOutputView;
Thread cThread;
private ConnectDevice cD = new ConnectDevice();
private DataRobot dR = new DataRobot();
private DataBuilder dB = new DataBuilder();
private DataSender dS = new DataSender();
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.intro);
final AlertDialog alert = new
AlertDialog.Builder(this).create();
Log.v("SmartApp", "inside sendalert");
//AlertDialog alert = new AlertDialog.Builder(this).create();
Log.v("SmartApp", "after builder1");
//Vibrator vibrator;
//vibrator = (Vibrator)
getSystemService(Context.VIBRATOR_SERVICE);
//vibrator.vibrate(500);
alert.setMessage("Testing alert dialog...");
alert.setCancelable(false);
alert.setButton("Ok", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
dialog.cancel();
}
});
Log.v("SmartApp", "after builder2");
//AlertDialog alert = builder.create();
alert.setTitle("Title");
cD.addDataReceivedListener(new DataReceivedListener() {
@Override
public void dataReceivedReceived(DataReceivedEvent
event) {
// TODO Auto-generated method stub
dR.analyzeData(event.getData());
}
});
dR.addDataAlertListener(new DataAlertListener() {
@Override
public void dataAlertReceived(DataAlertEvent event) {
Log.v("SmartApp", "data alert event caught");
alert.show();
}
});
}
}
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